Money & Cost

Flight Cost Optimizer (booking window analysis)

There's a sweet spot for booking international flights. We approximate the math.

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Origin → US city

Reference price you've seen (USD)

Weeks until departure

Flexibility

Carry-on only? No checked bag to save cost.

Red-eye OK? Red-eyes are usually cheaper.

Idle

How to use this calculator well

Pull your reference price from a specific quote you've seen — Google Flights is reliable.
Set weeks-out to your actual situation, not a wishful 'maybe'.
Increasing flexibility (tolerating ±3 or ±7 days) typically saves 8-15%.
Carry-on only and red-eye flights save another 10-15% each.

Frequently asked questions

When is the cheapest time to fly home?

For international flights, 8-12 weeks out is the consensus sweet spot. Off-peak days (Tuesday/Wednesday) save more. Peak holiday periods are always more expensive.

Should I book a round-trip or two one-ways?

Round-trip is usually 10-20% cheaper if your dates are certain. Two one-ways lets you mix airlines and adjust.

How early should I check prices?

Set a Google Flights alert 4-5 months out. Check daily, but only book when it dips 10-15% below the curve.

Where this estimate falls short

Historical averages — actual routes vary year to year.
Peak season (December, July-August) and rare events (sporting, conferences) shift the curve.
Airlines' dynamic pricing can punish repeat searches (or not, depending on heuristics).

Flight Cost Optimizer (booking window analysis)

Try it

How to use this calculator well

Frequently asked questions

Where this estimate falls short

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